CN101921947A - Nodular cast iron bent axle waste heat air cooling and normalizing method - Google Patents
Nodular cast iron bent axle waste heat air cooling and normalizing method Download PDFInfo
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- CN101921947A CN101921947A CN 201010257673 CN201010257673A CN101921947A CN 101921947 A CN101921947 A CN 101921947A CN 201010257673 CN201010257673 CN 201010257673 CN 201010257673 A CN201010257673 A CN 201010257673A CN 101921947 A CN101921947 A CN 101921947A
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Abstract
The invention provides a nodular cast iron bent axle waste heat air cooling and normalizing method. In the method, a smelting iron solution comprises the following five main elements in percentage by weight: 3.75-3.85% of C, 1.8-2.2% of Si, 0.76-0.82% of Mn, 0.05-0.09% of P and 0.001-0.024% of S; the temperature for discharging molten iron is 1480-1500 DEG C, and the temperature for pouring the molten iron is 1350-1430 DEG C; after pouring, the unpacking requirements are as follows: in serial production, unpacking is carried out for 12-16 minutes after finishing pouring; in intermittent production, unpacking is carried out for 11-15 minutes after finishing pouring; in the process of pouring multiple boxes, all iron mold unpacking time are controlled as follows: hot boxes are unpacked for 12-16 minutes after finishing pouring, and cold boxes are unpacked for 11-15 minutes after finishing pouring; and after being unpacked about 1 minutes, castings are sent to an air cooling area, and air blast cooling is carried out for above 30 minutes. Under the condition of not heating and normalizing the castings, the method can stably obtain nodular cast iron castings exceeding the QT-800-2 national standards, and can reduce the production cost with no need of reforming the existing iron mould sand coating production line.
Description
Technical field
The present invention relates to spheroidal graphite cast iron thermal treatment field, specially refer to the method for nodular cast iron bent axle waste heat air cooling and normalizing.
Background technology
Country 2003 technology in second batch of " state key industry clearer production technology guiding catalogue " mechanical industry in lining is numbered 15 technical name and mentions in for " cast condition ductile iron technology ": by control foundry goods speed of cooling, add alloying element, adjust chemical ingredients, adopt the compound inoculated measure of Denging, make foundry goods as cast condition reach the metallographic structure and the mechanical property of technical qualification regulation, thereby cancel heat treatment steps such as normalizing or annealing.The magnesium iron trade mark of as cast condition stably manufactured is: QT400-15, QT450-10, QT500-7, QT600-3, QT700-2.The weak point of this technology is that the spheroidal graphite cast iron trade mark all is lower than QT800-2, can not use in the high-grade nodular cast iron crank shaft field.
Casting subsidiary factory of Nanchong, Sichuan Province work factory Liu Wen river, Xia Chenghuai etc. show that at the article of " magnesium iron afterheat in casting normalizing and energy-conservation " that 1994 the 03rd phases of " oil engine " magazine deliver the material mark of ductile iron crankshaft can only reach QT600-3.
Jiangsu Province's Changzhou Diesel Engine Factory is mentioned waste heat (850 ℃) when utilizing foundry goods to unpack and hang defeated chain and send the blowing normalizing of spraying in " metal type sand-covering casting set technique ", obtaining the perlite more than 75%, thereby guarantee that foundry goods has the excellent comprehensive mechanical property.The shortcoming of this technology is: (1), " perlite more than 75% " its corresponding comprehensive mechanical performance can not satisfy high-grade nodular cast iron crank shaft, the technical requirements of content of pearlite in alloy more than 80%; (2), " hang defeated chain and send the blowing spraying ", existing device for sand coated iron mould production line is promoted difficulty; (3), transform infusion of financial resources greatly; (4), on existing device for sand coated iron mould line, utilization be subjected to the restriction that existing shop production line is arranged, " 850 ℃ " scope is Zuo too, can not lucky 850 ℃ when unpacking, unactual in big production.
Shandong Province Binzhou Head Crankshaft Co., Ltd., the thinking of proposition " alloying is assisted in the bent axle waste heat normalizing " in " casting of bent axle device for sand coated iron mould and production process control " delivered on May 5th, 2009 in Yin scholar's literary composition on the automobile industry website, way is " the micro-Sb that adds the strong promotion perliteization of 0.5%～0.6% Cu and trace in the molten iron treating processes; when casting temperature is unpacked during the 860-900 ℃ of left and right sides; change foundry goods over to cooling room rapidly then and carry out spray cooling, so just can obtain the spherulitic iron crankshaft blank of content of pearlite in alloy 85%-90% mechanical property QT800-3.The defective of this technology is: (1), " need add 0.5%～0.6% Cu ",, when a copper valency high position was paced up and down, the electrolytic copper that adds in the iron liquid once reached 86000 yuan/ton, also was 63000 yuan/ton now, and this technology does not possess tangible economic benefit advantage.(2), " change cooling room rapidly over to and carry out spray cooling ", utilization is subjected to the restriction that existing shop production line is arranged on existing device for sand coated iron mould line, does not see the data of utilization in practice so far.
Zhao Lijia, thanking to little equality delivers in " the bent axle process practice is produced in the waste heat normalizing " in " foundry engieering " 2003 the 24th the 04th phase of volume and proposes to produce with the composite alloying method, guarantee Cu content＞0.5%, when being cooled to 850 ℃, foundry goods unpacks, and the molding sand on bent axle surface is fallen in quick shake, evenly cooling is forced in the spraying of drying immediately, temper is carried out with electric furnace, reach the add-on that reduces automatic modeling crankshaft casting interalloy element, improve the comprehensive mechanical property of bent axle again, reduce production costs, produce the purpose of high-strength pearlitic bent axle, article shows that the first-class people of Zhao Li has made technological test three times with regard to this work.The defective of this technology is: (1), " produce guarantee Cu content＞0.5% with the composite alloying method ", as previously mentioned, add cost partial offset that Cu increases its save the economic benefit that electric furnace heating normalizing produces.(2), " unpacking when being cooled to 850 ℃ " can not implemented in big production, 850 ℃ of temperature that are meant foundry goods, and foundry goods is in the swage the inside, it in swage outside the temperature that is difficult to learn the inside, even if after certain statistical study, the temperature of unpacking also can only be that being controlled at 850 ℃ is in the certain limit of intermediate value.(3), " molding sand on bent axle surface is fallen in shake fast " do not have this necessity, this process has reduced the temperature of delivering to the bent axle of forcing the cooling work step, be unfavorable for improving perlite ratio and comprehensive mechanical performance and in production reality, the bent axle molding surface shakes with sand (except that scab) overwhelming majority in the process of the demoulding of unpacking, scab is very little to the quick refrigerative actual influence of foundry goods, has arrived negligible degree.(4), improve toughness with tempering again after the waste heat normalizing and also do not have this necessity, crankshaft material reaches trade mark toughness index after the waste heat normalizing, improving toughness by tempering again is exactly unnecessary operation, toughness is below standard after the waste heat normalizing, improves to illustrate that then this technology does not reach the technical requirements of high trade mark spherulitic iron crankshaft with tempering.
The casting hot water bath cooling normalizing process of spheroidal graphite cast iron, application number/patent No.: 87107076, its practice is that the foundry goods taking-up that reaches temperature requirement in the model is controlled its speed of cooling with the mode of water-bath, promote austenite to perlitic transformation, increase content of pearlite in alloy and refine pearlite, reach the normalizing purpose.This technology has been used the waste heat of foundry goods, but its technology mode is different fully with the present invention, so it is not compared analysis.
Summary of the invention
The object of the present invention is to provide a kind of reasonable utilization and adjust the speed of cooling of foundry goods more than eutectoid line, be aided with the method that the content of regulating perlite stable element Mn obtains to improve the nodular cast iron bent axle waste heat air cooling and normalizing of foundry goods mechanical property, this method has been saved by electric furnace again to foundry goods heating normalizing step.
For achieving the above object, technical scheme of the present invention is:
A kind of method of nodular cast iron bent axle waste heat air cooling and normalizing is particularly useful for ductile iron crankshaft, and the method for nodular cast iron bent axle waste heat air cooling and normalizing the steps include:
1, in the spheroidal graphite cast iron smelting iron liquid, except that the Fe element, the mass percent of other C, Si, Mn, P, S five big principal elements is:
C、3.75-3.85％ Si、1.8-2.2％
Mn、0.76-0.82％ P、0.05-0.09％
S、0.001-0.024％；
2, electric furnace goes out the temperature of molten iron and is: 1480-1500 ℃;
3, the temperature of hot metal ladle pouring molten iron is: 1350-1430 ℃;
4, require unpacking after the casting-up:
When device for sand coated iron mould production line is continuous production, when promptly being cast for hot-die, unpacked the foundry goods utilization deadweight demoulding in 12-16 minute from the cast end;
When device for sand coated iron mould production line is when be interrupted producing, when promptly being cast for cold mould, finish to unpack in 11-15 minute from cast, this moment, the cast(ing) surface temperature was controlled between 840-920 ℃, the foundry goods utilization demoulding of conducting oneself with dignity;
When device for sand coated iron mould production line was the cast of many casees, all swages time of unpacking all was controlled at from cast and finishes: hot-die is to unpack in 12-16 minute, cold mould be 11-15 minute unpacking;
5, foundry goods is controlled at 40-70 in second from the time of the demoulding of unpacking.
In the method for nodular cast iron bent axle waste heat air cooling and normalizing, the foundry goods drop out of unpacking should be delivered to the cooling of drying of air-cooled district at 40-60 in second, and the refrigerative time length of drying is 30-60 minute.
Positively effect of the present invention is:
1, foundry goods is not being reheated under the condition of normalizing, stably obtaining to be higher than the ductile iron crankshaft of QT800-2 national standard;
2, when obtaining pearlite matrix and carry out alloying, need not add expensive Cu, further reduced production cost;
3, do not need only need acquire a typhoon machine nearby, can implement, embody less investment, the advantage of instant effect existing device for sand coated iron mould mo(u)lding line input property transformation;
4, the present invention has widened the temperature range that when the waste heat normalizing is unpacked foundry goods is allowed, and has improved the reliability of technology assurance quality product;
The temperature range that when 5, the present invention will unpack foundry goods will be allowed changes into the time of unpacking, and has strengthened the operability of technology, is convenient to promote the use in big production;
Simple to operate when 6, the present invention uses, need not painstakingly to remove the residual sand of cast(ing) surface moulding; The present invention obtains the spheroidal graphite cast iron mechanical property and is higher than the QT800-2 national standard, and 3%, fragility was little when unit elongation was minimum, does not need tempering, has saved the technological process of electric furnace heating normalizing, and economic benefit is obvious.
Embodiment
Further specify the specific embodiment of the present invention below in conjunction with embodiment:
Embodiment 1
The sample title:: the YTR4105 bent axle, casting weight: 54Kg, material requirements: QT800-2, hardness requires: HB 240-320.
Be cast in a collection of seven casees 14 the YTR4105 bent axles of device for sand coated iron mould production line with same iron clad water, and to the cast first the case and last case detect.
1, the spheroidizing of spheroidal graphite cast iron smelting iron liquid in the electric furnace
Put into the spheroidizing material in hot metal ladle, the smelting iron liquid in the electric furnace is poured into carried out spheroidizing in the hot metal ladle, electric furnace molten iron tapping temperature is: 1492 ℃.
Except that the Fe element, the mass percent of other five big Elements C, Si, Mn, P, S is in the preceding spheroidal graphite Castiron Melting iron liquid of spheroidizing:
After the spheroidizing in the spheroidal graphite cast iron smelting iron liquid except that the Fe element, the mass percent of other five big Elements C, Si, Mn, P, S is:
2, unpack in casting-up and cast back
The site environment temperature is 20 ℃, and the temperature when hot metal ladle is poured into a mould first case is: 1390 ℃, the temperature when molten iron is poured into a mould the 7th case is: 1362 ℃; It is 12 minutes 8 seconds that first case foundry goods finishes to begin pitch time to unpacking from cast, and it is 15 minutes 53 seconds that the 7th case foundry goods finishes to begin pitch time to unpacking from cast; The cast(ing) surface temperature was 910 ℃ when first the case foundry goods was unpacked, and the cast(ing) surface temperature was 888 ℃ when the 7th the case foundry goods was unpacked.
3, first case foundry goods is 50 seconds from unpacking to demould time, and the 7th the case foundry goods is 55 seconds from unpacking to demould time.
4, first case foundry goods and the 7th case foundry goods are unpacked, and to deliver to air-cooled district refrigerative time of drying be 55 seconds for the foundry goods that drops out, and the cast(ing) surface temperature was 868 ℃ when first the case bent axle began the blowing cooling, and the cast(ing) surface temperature was 853 ℃ when the 7th the case bent axle began the blowing cooling.
5, first case foundry goods and the 7th case foundry goods blowing cool and add temperature-sensitive ingredients are 30 minutes.
Blower fan model: tube axial fan (SFNo6-4), power: 2.2Kwh; Rotating speed: 1450r/min; Air quantity: 18700m
3/ min.
Foundry goods sampling metallographic and mechanical property detected result
Metallographic structure
Mechanical property:
Embodiment 2
The sample title: the YTR4105 bent axle, casting weight: 54Kg, material requirements: QT800-2, hardness requires: HB 240-320.
1, the spheroidizing of spheroidal graphite cast iron smelting iron liquid in the electric furnace
Put into the spheroidizing material in hot metal ladle, to going into to carry out spheroidizing in the hot metal ladle, electric furnace molten iron tapping temperature is: 1493 ℃ with the smelting iron liquid in the electric furnace.
Except that the Fe element, the mass percent of other five big Elements C, Si, Mn, P, S is in the preceding spheroidal graphite Castiron Melting iron liquid of spheroidizing:
After the spheroidizing in the spheroidal graphite cast iron smelting iron liquid except that the Fe element, the mass percent of other five big Elements C, Si, Mn, P, S is:
2, unpack in casting-up and cast back
The temperature in hot metal ladle when cast is: 1392 ℃, casting pouring finish to the time of the beginning of unpacking be 12 minutes 58 seconds, the cast(ing) surface temperature is 903 ℃ when unpacking.
3, foundry goods is 45 seconds from unpacking to demould time.
4, unpack that to deliver to air-cooled district refrigerative time of drying be 50 seconds for the foundry goods drop out, the cast(ing) surface temperature is 860 ℃ when beginning the blowing cooling.
5, foundry goods blowing cool and add temperature-sensitive ingredients is 40 minutes.
Blower fan model: tube axial fan (SFNo6-4), power: 2.2Kwh; Rotating speed: 1450r/min; Air quantity: 18700m
3/ min.
Foundry goods sampling metallographic and mechanical property detected result
Metallographic structure
Mechanical property
Embodiment 3
The sample title: U.S. V8-442 racing car bent axle, casting weight: 32.5Kg, material requirements: QT800-2, hardness requires: HB 230-300.
Being cast in device for sand coated iron mould production line with same iron clad water pours into a mould.
1, the spheroidizing of spheroidal graphite cast iron smelting iron liquid in the electric furnace
Put into the spheroidizing material in hot metal ladle, the smelting iron liquid in the electric furnace is poured into carried out spheroidizing in the hot metal ladle, electric furnace molten iron tapping temperature is: 1486 ℃.
Except that the Fe element, the mass percent of other five big Elements C, Si, Mn, P, S is in the preceding spheroidal graphite Castiron Melting iron liquid of spheroidizing:
After the spheroidizing in the spheroidal graphite cast iron smelting iron liquid except that the Fe element, the mass percent of other five big Elements C, Si, Mn, P, S is:
2, unpack in casting-up and cast back
The temperature in hot metal ladle when cast is: 1382 ℃, casting pouring finish to the time of the beginning of unpacking be 13 minutes 03 second, the cast(ing) surface temperature is 845 ℃ when unpacking.
3, foundry goods is 53 seconds from unpacking to demould time..
4, unpack that to deliver to air-cooled district refrigerative time of drying be 60 seconds for the foundry goods drop out.
5, foundry goods blowing cool and add temperature-sensitive ingredients is 48 minutes.
Blower fan model: tube axial fan (SFNo6-4), power: 2.2Kwh; Rotating speed: 1450r/min; Air quantity: 18700m
3/ min.
Foundry goods sampling metallographic and mechanical property detected result
Metallographic structure
Mechanical property
The above only is a non-limiting embodiment of the present invention; for the person of ordinary skill of the art; not breaking away from the invention design and not making under the prerequisite of creative work, can also make some distortion and improvement, these all belong to protection scope of the present invention.
Claims (1)
1. the method for a nodular cast iron bent axle waste heat air cooling and normalizing is particularly useful for ductile cast iron casting, it is characterized in that, the method steps of nodular cast iron bent axle waste heat air cooling and normalizing is:
(1), in the spheroidal graphite cast iron smelting iron liquid, except that the Fe element, the mass percent of other C, Si, Mn, P, S five big principal elements is:
C、3.75-3.85％ Si、1.8-2.2％
Mn、0.76-0.82％ P、0.05-0.09％
S、0.001-0.024％；
(2), electric furnace goes out the temperature of molten iron and is: 1480-1500 ℃;
(3), the temperature of hot metal ladle pouring molten iron is: 1350-1430 ℃;
(4), require unpacking after the casting-up:
When device for sand coated iron mould production line is continuous production, when promptly being cast for hot-die, unpacked the foundry goods utilization deadweight demoulding in 12-16 minute from the cast end;
When device for sand coated iron mould production line is when be interrupted producing, when promptly being cast for cold mould, finish to unpack in 11-15 minute from cast, the foundry goods utilization deadweight demoulding, the cast(ing) surface temperature is controlled between 840-920 ℃ at this moment;
When device for sand coated iron mould production line was the cast of many casees, all swages time of unpacking all was controlled at from cast and finishes: hot-die is to unpack in 12-16 minute, cold mould be 11-15 minute unpacking;
(5), foundry goods is controlled at 40-70 in second from the time of the demoulding of unpacking.
(6), the foundry goods drop out of unpacking should deliver to the cooling of drying of air-cooled district at 40-60 in second, the refrigerative time length of drying is 30-60 minute.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102576737A CN101921947B (en) | 2010-08-12 | 2010-08-12 | Nodular cast iron crankshaft waste heat air cooling and normalizing method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102576737A CN101921947B (en) | 2010-08-12 | 2010-08-12 | Nodular cast iron crankshaft waste heat air cooling and normalizing method |
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| CN101921947A true CN101921947A (en) | 2010-12-22 |
| CN101921947B CN101921947B (en) | 2011-11-09 |
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|---|---|---|---|
| CN2010102576737A Expired - Fee Related CN101921947B (en) | 2010-08-12 | 2010-08-12 | Nodular cast iron crankshaft waste heat air cooling and normalizing method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107952936A (en) * | 2017-12-30 | 2018-04-24 | 晋江亿兴机械有限公司 | The swage hanging sand method production technology of spheroidal graphite cast-iron |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5980715A (en) * | 1982-10-30 | 1984-05-10 | Mazda Motor Corp | Production of spheroidal graphite cast iron having high resistance to fatigue |
| JP2002038217A (en) * | 2000-07-26 | 2002-02-06 | Ube Steel Co Ltd | Method for producing cast iron component |
| CN1472356A (en) * | 2003-04-26 | 2004-02-04 | 广西玉林玉柴机器配件制造有限公司 | Manufacturing method for nodular cast iron |
| CN1900328A (en) * | 2005-07-19 | 2007-01-24 | 辽宁五一八内燃机配件有限公司 | Heat treatment process for large microalloyed medium carbon steel engine crankshaft |
-
2010
- 2010-08-12 CN CN2010102576737A patent/CN101921947B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5980715A (en) * | 1982-10-30 | 1984-05-10 | Mazda Motor Corp | Production of spheroidal graphite cast iron having high resistance to fatigue |
| JP2002038217A (en) * | 2000-07-26 | 2002-02-06 | Ube Steel Co Ltd | Method for producing cast iron component |
| CN1472356A (en) * | 2003-04-26 | 2004-02-04 | 广西玉林玉柴机器配件制造有限公司 | Manufacturing method for nodular cast iron |
| CN1900328A (en) * | 2005-07-19 | 2007-01-24 | 辽宁五一八内燃机配件有限公司 | Heat treatment process for large microalloyed medium carbon steel engine crankshaft |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107952936A (en) * | 2017-12-30 | 2018-04-24 | 晋江亿兴机械有限公司 | The swage hanging sand method production technology of spheroidal graphite cast-iron |
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| CN101921947B (en) | 2011-11-09 |
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